Energy, Latency: I Love You, I Love You Not
summary
A survey of cellular radio mechanisms that trade energy for latency, covering the RRC state machine (transitions of ~0.5–2 s and hold timers typically 10–15 s), DRX/eDRX/PSM sleep cycles from milliseconds to hours, and measured costs like modem ~2 W drawing a 10 Wh battery (~5 h). Uses a state‑machine simulator and Android network hints (grouped requests) to show how changing timers and bearer classes (VoLTE vs Internet) impacts latency and battery, with concrete numbers such as 1 ms radio frame in 4G vs 10 ms in 3G.
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chapters (11)
- 0:00Energy vs network latency
- 1:54Mobile network generations
- 8:37UMTS architecture
- 13:13DRX and DTX mechanisms
- 21:583G to 4G impacts
- 28:45RRC state simulation
- 30:11QoS and VoLTE
- 32:41Advanced DRX for IoT
- 34:10Wi-Fi power saving
- 35:355G characteristics
- 39:51Energy-latency conclusion
